AFNetWorking请求头的设置

AFHTTPRequestOperationManager*manager=[AFHTTPRequestOperationManagermanager];
manager.securityPolicy=[AFSecurityPolicypolicyWithPinningMode:AFSSLPinningModeNone];
manager.requestSerializer=[AFJSONRequestSerializerserializer];
manager.responseSerializer=[AFJSONResponseSerializerserializer];
[manager.requestSerializersetValue:@"application/json"forHTTPHeaderField:@"Accept"];
[manager.requestSerializersetValue:@"application/json;charset=utf-8"forHTTPHeaderField:@"Content-Type"];

还有一种就是直接进入AFN源码添加请求头，这样就可以不用每次都设置了

 self.acceptableContentTypes = [NSSet setWithObjects:@"application/json", @"text/json", @"text/javascript", nil];

  AFN的AFURLResponseSerialization.m中有这样一个请求头的设置，直接全局搜索，然后添加想要的请求头格式就可以了！